The Spanish artist's birthday celebration took place in Paris, France Wednesday evening at the Hotel Particulier -- which sits in the romantic city's Montmartre neighborhood.

Rosalía dressed to the nines for her party, stepping out in a chic white top and matching flared skirt, carrying a brown fur stole. Who said you can't wear white after Labor Day???

Of course, Rosalía's A-list attire made sense, as she was surrounded by a number of fashionable faces at her party ... including Kylie Jenner, Kendall Jenner, Gigi Hadid, Irina Shayk, Willow Smith, Stassie Karanikolaou, Hunter Schafer, Anya Taylor-Joy, Jordyn Woods, Amelia Gray Hamlin, Fai Khadra, Bad Gyal, Tokischa, Victoria Villarroel, and Achraf Hakimi.

Though, we should note, Paris Fashion Week likely helped curate the star-studded guest list ... given the fact that most of these celebs were already in town for the seasonal event.

Nonetheless, plenty of stars looked giddy to be out and about celebrating Rosalía. Kendall and Gigi arrived at the hotel holding onto one another ... with GH rocking a fall-theme maxi skirt, and KJ channeling Bianca Censori with her nude-colored dress.

Sister Kylie also put on a bold display ... opting for a strapless, black leather minidress. While Kylie entered the party with BFF Stassie, her former bestie, Jordyn Woods, who she's reconnected with after controversy, also made an appearance at the party.

Rosalía certainly has a lot to celebrate ... in addition to her birthday, the singer dropped a new song, "Omega," on Tuesday. The song, which features music artist Ralphie Choo, teases what's to come for her upcoming album ... her first in a couple years.